Threshold prevented over 2,500 people from becoming homeless in the first three months of the year.
The housing charity says that included one thousand children.
It says two-thirds of its clients were put at risk of homelessness during quarter 1 when their landlord gave them a notice of termination.
Threshold, says this is becoming more commonplace, with thousands of landlords having left the sector in recent years. The housing charity says this results in an ever-shrinking pool of properties for rent, increasing the risk of homelessness for those being evicted.
Threshold says it's deeply concerned about this issue and has urged Government to take action to keep landlords in the sector, in particular the smaller landlords who provide most rental homes in Ireland.